Automatic disengaging device for belt-pulleys.



C. W. F. HANSE.

AUTOMATIC DISENGAGING DEVlCE FOR BELT PULLEYS.

APPLICATION FILED JUNE 1-0. 1913.

Patented July 27', 1915.

2 SHEETS-SHEET 1.

8. W. F. HANSEN.

AUTOMATIC DISENGAGING DEVICE FOB BELT PULLEYS.

APPLICATION FILED JUNE 10. 19I3.

Patented July 2 SHEETS-SHE ET 2.

cu 1 6 w e my M masons.

To all wlipm .inay concern Be it known that LG nrs'rorn Winners FERDINAND, Hansen,- 21 subject of the Eurv .to the driving. mechanism machii'ie is rendered impossible and very CHRISTOPEI W. HANSEN, OE FLENSBUBG, GERMANY.

peror of Germany, residing at Flensburg;

Germany, have invented certain new and useful Improvements in Automatic Disem gaging Devices for Belt-Pulleys,-of which the following is a speoification.

The present invention relates to a dis-engaging device for belt pulleys, and comprises a clutch device actuated by overload,

which uncouples the driving pulley auto-- matically from the drive shaft and at the same time shifts the belt from the driving pulley to an idle pulley, the shifting device operating to release one or more electric signal devices suitably located to indicate that the machine is running idle. By means of-this invent-ion it is-also possible to shift the belt from the driving pulley to the idle T pulley at will from a given location.

With this-disengaging device any damage or the working reliable workingassured. For example,

' when the working machine is overloaded or there are extraordinary resistances in the.

driving gear, the driving pulley is auto.

pluatically uncoupled from the shaft and its belt at the same time is thrown out of action. Further, .m'the case oi unforeseen circum-' stances, for example, the belt-of the driving pulley can be thrown out of engagement at any time as desired One embodiment oi: the invention is shown in the accompanying drawing, in

from any [distant place.

Figure 1 isa side elevation of the driving pulley, with the clutch device, the electro magnetic belt shitting device, and the switch arrangements; Fig. 2 is a t'ront elevation'of the belt shifting device with the electromagnet and the signaling device; Fig. .3 shows diagrammatically an euample of the switch arrangement for the disengaging device connected with an electric circuit; Fig.

l is a detail elevation of a lock bar employed according to the 1nvent1'on;'F1g. 5 1s a transverse section of one of the locking devices for a clutch member.

Referring more specifically to said drawing it indicates the idle" ulley which rotates loosely upon the sha i710, and b indicates the driving pulley which ,is also freely journaled on the shaft 10. [,An annu ,lar disk is fixed on shaft l0, ladjecent to AUTOMATIC prsnrzreeomennvics non sear-runners.

Specification of Letters lletent.

Patented July 27 l9t5,

Application filed June 10,-9131.. Serial No. 772,89tl.

- as driving pulley b, and has two diagonally opposite flared recesses 6 which receive the projections b of two pawls cgwhich are 'pivotally fixed'to the center or web of the driving pulley b. The free ends ofpawls c are oppositely disposed and each drawn-to Ward the pivoted end of the other, sons to pawls c are removed from the annular disk '5, the pins 0 are pressed by their springsc into corresponding recesses in the web of. the driving pulley I), and are there firmly held so that the pulley remains out of engagenient with the annular disk '5, and the driving pulley b' which is now uncoupled from the annular disk .1 can then rotate freely on the shaft 10. Each of the pawls a has a pin (IF which is'so arranged that upon movement of the pawls mitward the pins will engage an arm 6 which is pivoted outside the 2 and 4)-' which may be raised by arm a.

pulley bat a fixedpoint c Immediately above tins arm 6 is a lock bar f (see Figs. 1, 1.

Lock bar 7'' engages by means of a beveled nose f in an opening 9 of a sleeve 9 which slides on a bar. II and carries a belt fork. The slide is thereby held firmly. in normal position by the lock bar A .suficiently powerful electromagnet coil is securely fixed immediately above the lock bar 7' and connected with a source of current 35 by means of conductors in which one'or. more switch devices are inserted at suitable places for energizing the electromagnet s when it is desired to withdraw the loclsher f from sleeve 9 to release the belt shiftin mechanism as will .be described. The loci bar is normally held in its lower position (loc ting the sleeve 9) by means of a spring 0'. A hell crank lever, having a slotted arm h and a weighted arm f r-engages a pin on sleeve g and tends,

by reason of its weighted arm h, to throw the sleeve g to the left in Fig. 2 and thereby shift the belt trom wort: pulley b to idle pulley a. The lock bar normally prevents this actuation of the slide glt will thus be apparent that loot-5 bar f controls the shifting of the belt, and

the lock bar in turn is actuated by the magnet *8 or theclutch mechanism of pulley Z)- and shaftlO, On the "arm A} of the bell crank lever a contact spring is is arrangedfi lvhen thelever ill, 71 is moved to the left,

i thaty is to say,'when the belt is shifted to idldpositiomthis spring comes in contact 1 with a. contact Zand thereby connects the source of curent mand operates signal devicesfsucltas bells a, n n Thus as long asthe beltremainslon the idle pulley, the

i the fact that the belt is running idle. l5 p UWhen an overload occurs, the projections b signalbells n, '11 n will continue to indicate Theoperation of the device is as follow:

fofpawls a areforced out of the flared recesses 6 thereby freeing pulley b from shaft 10 and causin the engagement of pins 03 with arms. otation of the pawls with the pulleyb thus effects the raising of arm 6 and lock bar 7 to release the slide g. The

weighted bell crank lever is thereupon free to shift the belt fromthe driving pulley to 2 1 nounce the fact that the belt is then run idle pulley a. Signal bells a, a a an ning idle. For throwing the machine out {10f operation under manual control, as upon i tretionwith the recesses in the center or Web of-belt pulley b whereupon their springs 0*. press thepinsintothe recesses to lock the pgtwls against f lgsgba k into the recesses .40

thevoccurrence of accident or emergency, one

of the switches ris closed, thereby energizing magnet s and thus withdrawing lock bar f rom sleeve 9 and releasing the belt shift as already described. Referring again to theautomatic thro'wout, the pawls c in moving outwardly bring the p nsc into regis- -Thus thepawis areheld firmly so that the pins canpositively raise the arm 6.

in wine:

awing locking pins 42 the pawls ere againj'released and their projections 13 'ret urned to the recesses h, The driving pulley is thereby again connected with the drive shaft 10 for transmitting power.

In place of battery j it is obvious that any suitable conductors or line wires may be employed for energizing magnet coil 8, as illustrated, for example, in Fig. 3, in which the several switches are in parallel to each other and each of them is in series with the magnet coil.

I claim:

1. A mechanical stop motion comprising in combination a shaft to be driven, a belt pulley loosely associated therewith, means I for clutching said belt pulley to said shaft "associated with said shaft, a pawl pivoted totheface of said belt pulley havinga projection adapted to engage the notch of said disk, means for holding said projection in engagement with said notch up to a predetermined load, a belt shifter, a belt controlled thereby for driving said belt pulley, a lock for preventing actuation of said belt shifter and means operated by said pawl for disengaging said belt shifter from said looking means.

In testimony whereof I affix my signature in presence of two witnesses.

' @JHRISTOPH W. F. HANSEN. l/Vitnesses:

KARL Fninmuon FUNQZEL, lVAL'rnn ROHDE. 

